Translucency effect rewritten in JavaScript

Supported Features:
* move/resize
* active/inactive
* special window type
* window decoration as missing in AnimationEffect

The animations are cancelled when they go into an invisible state (e.g.
desktop changed, minimized) and are set again when the window becomes
visible.

Where a transition is useful, the window gets animated, e.g. start/finish
of move resize.


FIXED-IN: 4.11
REVIEW: 110747